102. If any person-(a) obstructs or molests any person with whom the Chairman has entered into a contract on behalf of the Authority, in the performance or execution by such person of his duty or of anything which he is empowered or required to do by virtue or in consequence of this Ordinance of any rule hereunder; or (b) removes any mark set up for the purpose of indicating any level or direction necessary to the execution of works authorised by this Ordinance or any rule made or scheme sanctioned hereunder, he shall be punishable with fine which may extend to five hundred taka, or with imprisonment for a term which may extend to two months.